Is pre-cal, trigonometry, calculus and physics hard to learn?

[My Name is Mudd]

I am starting college and I am really interested in astronomy and planetary sciences. So, that means I need a lot of physics and calculus. I was just wondering. Is it hard to learn these subjects? There's no turning back for me. I am fully committed to this task before me. I have plenty of resources, help, and tutoring at my reach, so I really don't have any excuse.

Will I be okay? I could use some words or encouragement. Thanks.